The discovery process matches the sysObjectID to an OID in the oid2type configuration files to identify:
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System’s type (Host, Router, Switch, and so on), vendor, model, and certification level.
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Which discovery drivers to use to probe the system.
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Which instrumentation classes to use to monitor the system.
The discovery process searches for the drivers in the .import files, which are located in the BASEDIR/smarts/conf/discovery directory as the oid2type files.